Submitted to: United States Animal Health Association Proceedings
Publication Type: Proceedings
Publication Acceptance Date: October 29, 1994
Publication Date: N/A
Technical Abstract: Reticuloendotheliosis virus (REV) was isolated in 1994 by Dr. Aly Fadly from a commercial fowlpox vaccine that had been administered off label in conjunction with reovirus vaccine to two broiler breeder flocks in Alabama at 7 days of age. Both flocks developed a lymphoid leukosis-like syndrome. The same vaccine had been given at about 10 weeks of age, as recommended by the manufacturer, to other broiler breeder flocks in this operation where seroconversion occurred but no tumors were noted. Also, the same subtype of REV was isolated from the vaccine and the chickens. Thus, there appeared to be a correlation between the early use of this contaminated vaccine and the RE lymphomas.